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tps54560求指教

Other Parts Discussed in Thread: TPS54560

   我用TPS54560做了一个5V的稳压模块,当输入电压10V输出电流在3A时听见响声,加大输入电压响声就没了,请问这是为什么? 另外3A时芯片很烫,二极管用的B560C也很烫,不敢用手摸,请问怎么散热合适?在上面涂硅胶可以么?谢谢。